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Post subject: Retubing a Super-Sonic
Posted: Fri Jan 16, 2009 6:02 pm
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I need/want to put some new preamp tubes in my Super-Sonic. I'm not certain which socket is the phase inverter. Is there something specific I need to be concerned with when choosing a tube for the phase inverter?


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Posted: Fri Jan 16, 2009 7:24 pm
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Phase inverter is V6. Others:

V1 12AX7WC? - V1A is the input stage, V1B is the first gain stage of the drive channel (between gain1 and gain2)

V2 12AX7WC? - Used in the Clean channel. V2A is the usual BF-type post tonestack/volume stage. after that, there is the preshaping filter (part of the Vibrolux/Bassman-switching) followed by V2B as a buffer stage

V3 12AX7WC? - Used in the Burn channel as second (V3A) and third (V3B) gain stage, followed by the tone stack and master volume

V4 12AX7WC? - V4A is a buffer stage after the switching relay between clean and burn. V4B is the effects loop send buffer stage

V5 12AX7WC Effects Loop - V5A is the effects loop return buffer stage, V5B is the reverb mixer stage

V6 12AT7 Phase Inverter

V7 6L6GC Power Section

V8 6L6GC Power Section

V9 12AT7 Reverb - Reverb send stage

V10 12AX7WC - Reverb makeup/buffer


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Posted: Fri Jan 16, 2009 9:30 pm
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Thanks for the info. :) Is it imparative that the 12ax7 is a "wc"? Would it hurt to replace a couple of them with a GT12ax7-M or another 12ax7 type? On the same note, would there be a problem with replacing the 6L6GC's with 6L6GE's?


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Posted: Sun Jan 18, 2009 7:18 am
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TweedDogSteve wrote:
Phase inverter is V6. Others:

V1 12AX7WC? - V1A is the input stage, V1B is the first gain stage of the drive channel (between gain1 and gain2)

V2 12AX7WC? - Used in the Clean channel. V2A is the usual BF-type post tonestack/volume stage. after that, there is the preshaping filter (part of the Vibrolux/Bassman-switching) followed by V2B as a buffer stage

V3 12AX7WC? - Used in the Burn channel as second (V3A) and third (V3B) gain stage, followed by the tone stack and master volume

V4 12AX7WC? - V4A is a buffer stage after the switching relay between clean and burn. V4B is the effects loop send buffer stage

V5 12AX7WC Effects Loop - V5A is the effects loop return buffer stage, V5B is the reverb mixer stage

V6 12AT7 Phase Inverter

V7 6L6GC Power Section

V8 6L6GC Power Section

V9 12AT7 Reverb - Reverb send stage

V10 12AX7WC - Reverb makeup/buffer

What do you mean by V1A and V1B? Its just one tube right?


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